Long-term Debt and Short-term Borrowings (Schedule of Long-term Debt Instruments) (Details) (USD $) In Thousands, unless otherwise specified																			12 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 13, 2012 7.875% Senior Notes due February 15, 2019 [Member]	Dec. 31, 2013 Parent Company [Member]		Dec. 31, 2012 Parent Company [Member]		Dec. 31, 2013 Parent Company [Member] 5.125% Subordinated Notes due June 15, 2017 [Member]	Dec. 31, 2012 Parent Company [Member] 5.125% Subordinated Notes due June 15, 2017 [Member]	Dec. 31, 2013 Parent Company [Member] 7.875% Senior Notes due February 15, 2019 [Member] Senior Notes [Member]		Dec. 31, 2012 Parent Company [Member] 7.875% Senior Notes due February 15, 2019 [Member] Senior Notes [Member]		Dec. 31, 2013 Parent Company [Member] 4.875% Subordinated Notes due February 15, 2013 [Member]	Dec. 31, 2012 Parent Company [Member] 4.875% Subordinated Notes due February 15, 2013 [Member]	Dec. 31, 2013 Parent Company [Member] 13.00% Junior Subordinated Amortizing Notes with Quarterly Interest and Principal Payments through May 15, 2013 [Member]	Dec. 31, 2012 Parent Company [Member] 13.00% Junior Subordinated Amortizing Notes with Quarterly Interest and Principal Payments through May 15, 2013 [Member]	Dec. 31, 2013 Parent Company [Member] LIBOR Plus 1.80% debentures, due April 19, 2035 with quarterly interest payments and principal to be paid at maturity (rate of 2.04% and 2.11% at December 31, 2013 and 2012, respectively)	Dec. 31, 2012 Parent Company [Member] LIBOR Plus 1.80% debentures, due April 19, 2035 with quarterly interest payments and principal to be paid at maturity (rate of 2.04% and 2.11% at December 31, 2013 and 2012, respectively)	Dec. 31, 2013 Synovus Bank [Member]	Dec. 31, 2012 Synovus Bank [Member]	Dec. 31, 2013 Synovus Bank [Member] FHLB Advances [Member]	Dec. 31, 2012 Synovus Bank [Member] FHLB Advances [Member]	Dec. 31, 2013 Synovus Bank [Member] Other Notes Payable and Capital Leases [Member]	Dec. 31, 2012 Synovus Bank [Member] Other Notes Payable and Capital Leases [Member]	Dec. 31, 2013 Subsidiaries [Member] FHLB Advances [Member]	Dec. 31, 2012 Subsidiaries [Member] FHLB Advances [Member]	Dec. 31, 2013 Subsidiaries [Member] Other Notes Payable and Capital Leases [Member]	Dec. 31, 2012 Subsidiaries [Member] Other Notes Payable and Capital Leases [Member]
Debt Instrument [Line Items]
Subordinated notes				$ 206,800					$ 450,000	$ 450,000					$ 0	$ 60,612
Long-term debt											294,606	[1]	293,554	[1]
Junior subordinated notes																	0	13,566
Unsecured debt																			10,000	10,000
Hedge-related basis adjustments					10,701	[2]	13,935	[2]
FHLB advances with interest and principal payments due at various maturity dates through 2018																							1,265,354	880,701
Other notes payable and capital leases with interest and principal payments due at various maturity dates through 2031																									2,480	4,087
Long-term debt	$ 2,033,141	$ 1,726,455			$ 765,307		$ 841,667														$ 1,267,834	$ 884,788
Stated percentage									5.125%	5.125%					4.875%	4.875%	13.00%	13.00%
Description of variable rate basis																			LIBOR	LIBOR
Basis spread on variable rate																			1.80%	1.80%
Interest rate at period end	0.13%	0.16%	0.24%																2.04%	2.11%
Stated percentage rate range, minimum																											0.28%
Stated percentage rate range, maximum																											4.66%
Weighted average interest rate																											0.64%	0.71%	2.49%	3.89%

[1] Balance is net of capitalized debt issuance costs and discount

[2] Unamortized balance of terminated interest rate swaps reflected in debt for financial reporting purposes.